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Problem with "HEATER CONTROL (MODE AND TEMP)"

Hello.
I have a problem with the buttons that u press to change between windsield, legs, legs and face.... (it's 5 buttons, 1 under 1). when i press one of the buttons, the way that the air need to come out not chaned. it's stuck in position that let the air come out to legs and windshield only and if i press one of the other buttons, the way that the air need to come out not chaned. even when i push the button that switch between outside or inside air it's not working too.
What could be the problem and how can i solve it? in the parts book i found that whole unit that call: "HEATER CONTROL (MODE AND TEMP)" and there is a part that i think that he is the troublemaker, it call "MODE SELECT VALVE". do u think that this should solve the problem? or i'm wrong?
In order to fix this problem i need to open all the dashboard or there are screws just for this unit?

The heat output selection is controlled by vacuum, make sure the vacuum line to the engine, the check valve and accumulator tank are all working correctly. If proper vacuum is being delivered to the “Mode Select Valve” but the controls still do not work then the vale may be the problem. The heater control can be removed by removing the bezel around the gauges and the screws under the heater control buttons.Gary